Adjustable automatic brake.



No. 764,038. PATENTED JULY 5,1904.

' M. P. CARPENTER.

ADJUSTABLE AUTOMATIC BRAKE. 1

APPLIOATION FILED r213. 29. 1904. I H0 MODEL.

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UNITED STATES ATENT rricn.

MASON P. CARPENTER, OF MEXICO, MISSOURI, ASSIGNOR OF ONE-HALF TO WALLER L. REED, OF MEXICO, MISSOURI.

ADJUSTABLE AUTOMATBC BRAKE.

SPECIFICATION formingpart of- Letters Patent No. 764,038, dated July 5, 1904.

Application filed February 29, 1904. Serial No. 195,809. (No model.)

To all whom it may concern.-

Be it known that I, MASON P. CARPENTER, a citizen of the United. States, residing at Mexico, in the county of A-udrain and Statematically-operable brake for elevator-cars and various other movable devices.

The object of the present invention is to improve the construction of brakes for elevatorcars and various other movable vehicles and to provide a simple, inexpensive, and efficient device capable of effectually preventing an elevator from dropping to the bottom of the shaft should the cable break or the car otherwise become disconnected from the controlling devices.

A further object of the invention is to provide an adjustable automatically operable device adapted'to be thrown into operation through centrifugal force when the speed increases beyond a predetermined point.

The invention also has for its object to enable the automatically-operable brake to be readily adjusted to cause it to operate when the desired speed is attained by the rotary element on which it is mounted.

With these and other. objects in view the" invention consists in the construction and, novel combination and arrangement of parts.

hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended,.it being understood that various changes in the form, proportion, size, and minor details of construction within the scope of the claims may be resorted to without departing from the spirit or sacrificing any of the advantages ofthe invention. p

In the drawings, Figure 1 is an elevation of a portion of an elevator provided with automatic brakes constructed in accordance with this invention. Fig. 2 is a horizontal sectional view on the line 2 2 of Fig. 1. Fig. 3 is a transverse sectional view on the line 3 3 of Fig. 2. the line 4 4: of Fig. 3, illustrating the manner cident to the dog engaging the rack.

Fig. 1 is a detail sectional view on of mounting the spring-actuated bars or members. Fig. 5 isa vertical sectional view taken on the line 5 5 of Fig. 2.

Like numeralsof reference designate corresponding parts in all the figures of the drawings.

ldesignates an elevator-car, provided at opposite sides with automatically operable brakes, each comprising a pair of rotary elements or wheels 2, arranged to run on the adjacent track 3 at opposite sides of a central rack a, having teeth formed by recesses, as

with top flanges, and the latter are pierced by bolts or other suitable fastening devices for securing the brackets to the bottom of the car. The bearing or journaled boxes are provided at opposite sides with flanges, as shown in Fig. 3, and are preferably sectional, as shown in Fig. 1, to enable the parts to-be readily assembled; but they may be constructed in any other desired manner, as will be readily understood. The slots 7 are disposed horizontally and receive coiled springs 9, which normally hold the boxes extended and which are adapted to cushion a dog 10, suspended between the wheels and adapted to engage the rack, as hereinafter explained, the springs being arranged to relieve the car of the sudden jar in- The dog is provided with an enlarged. :head 11, forming lateral extensions which project beyond a shank 12 and whicharc arranged in the path of spring-actuated bars or members 13. The bars or members 13 are housed Within suitable casings 14, carried by the Wheels 2 and arranged at the inner faces thereof at opposite sides of the shank 12. The casings 14 are provided at opposite sides of the shaft with. longitudinal openings to receive, the bars or members, and the latter 'are located at opposite sides of the shaft and are set at an angle, as clearly shown in Fig. 5, whereby the bars or members extend in opposite direcmembers 13 are prevented frem being accidentally thrown outward by a quick upward movement'of the elevator-car. This will prevent the brake'from.beingoperated when the elevator-car moves upward and there will be no liability of such an operation breaking the cable which is connected with the car. The

tions, and when thrown outward the wheel will be permittedto make only one-half a revolution before the dog is engaged by one of the bars or members. Each bar or mem-,

her is provided with a longitudinal slot or opening 16, which receives a coiled spring 15, engaging the wall at the inner end of the slot or opening 16 and a transverse fastening device 18 which passes through the slot or opening16, limits .the inward movement of the bar or member.

ers 19 between the inner ends of the springs and the inner wall of the slot or opening 16, and by this construction the spring may be readily adjusted to permit the bar or mem-V ber 13 to be-thrown outward when the wheel attains the desired speed. The dog, which is ar- I ranged in the path of the bar or members 13 when the latter are extended, is adapted to be swung outward to the position illustrated in dotted lines in Fig. 5 of the drawings, whereby it is carried into engagement with the rack. By this construction the elevator-car is positively prevented from dropping to the bottom of the elevator-shaft. The bars or members 13 are located. at opposite sides of the shank of the dog, and the projecting head of the latter will be engaged at each side, whereby the dog will be positively carried into engagement with the rack. When the dog engages the rack, it will hold the car until th'e'weight'of'the same is lifted from it. It will then swing back by gravity to the vertical position illustrated in full lines in Fig. 5.

The automatic, brake is capable 0f universal application and when applied to amachine or vehicle moving on the surface of theground afixed portion of the frame of the car or machine may be arranged in the path of the rotary spring-engaged bars or members.

The tension of the spring may be varied by interposing plates or wash-- The device will be found especially advantageous on agricultural machinery and will prevent the draft-animals running away with the same.

It is to be understood that the term car or vehicle used in the claims comprehends any moving partto which the invention may be applied and that the term track may accurately refer to the part the car runs on or a mere guide or a rack.-

Having thus described my invention, what 1 claim as new, and desire to secure by Letters Patent, is-.

1. An automatic brake, comprising a rotary member normally held in. an inoperative position and adapted to be thrown outward by centrifugal force, and a locking-dog for engaging a relatively fixed part arranged in the pathof the rotary member when the same is extended and directly engaged by the same, substan tially as described.

' 2. In an automatic brake,the combination of a track, a wheel movable on the track and having a rotary member normally held in an inoperative position and adapted to be thrown outward by centrifugal force, and a dog arranged in the path of the member when the same is extended, said dog having a direct engagement with the track, substantially as described. 3. .In an automatic brake,the combination of a vehicle, a track for the same, a wheel mounted on the vehicle and engaging the track, a member also carried by the vehicle and adapted to be thrown outward by centrifugal force communicated through the rotation of the wheel, and a dog arranged in the path of the member when the same is extended, said dog having a direct engagement with the track, substantially as described.

t. In an automatic brake,the combination of a wheel having a casing, a member slidable in the casing and adapted to be thrown outward by centrifugal force, said member being providedbetween its ends with an opening, a fastening device carried by the casing and extending through the opening, a coiled spring arranged in the opening of the mem her for holding the same normally against outward movement, means for adjusting. the spring for varying the tension thereof, and locking mechanism arranged in the path of the member when the same is extended, substantially as described.

5. In an automatic brake,the combination of a rotary member normally held in an inoperative position and adapted to be thrown outloo Ward by centrifugal force, a dog arranged in the path of the member when the same is extended, said member and dog having a common pivotal point, means arranged to be engaged by the dog, and means for cushioning the dog, substantially as described.

6. In an automatic brake, the combination of a shaft, a rotary member carried by the shaft and normally held against outward movement and adapted to be extended by centrifugal force, a .dog mounted on the shaft and ar-.

ranged in the path of the member when the same is extended, and a spring for cushioning the-shaft, substantially as described.

7. 'I n an automatic brake,the combination of brackets having openings, boxesslidable in the openings, a shaft mounted in the boxes,-

springs engaging the boxes for cushioning the shaft, a rotary member normally held against outward movement and adapted to be" thrownoutward by centrifugal force, and a dog mounted on the shaft and arranged in the path of the rotary member when the same is extended, substantially as described.

8. In an automatic brake,the combination of opposite brackets, a shaft supported by the brackets, wheels mounted on the shaft and provided at their inner faces with "casings, 

